Ok, in your 0.80 tab in wyBuild get the filename for the "Interfaces.pak" file you're trying to update. (Click the file in wyBuild and it should list a "Local path" like "C:\Your Original Versions\0.80\Interfaces.pak".)
Go to that exact file and copy & paste it into some folder you can go back to. Rename the copied file to "a.pak"
Now, for the working version that you're trying to update: Get the Interfaces.pak file and paste it in the same folder as "a.pak". Rename the newly copied file to "b.pak".
Now if these files are small enough (20 Mb or so) send them to me at wyatt@wyday.com. Otherwise you'll need to do a bit more work.
If the files are bigger than 20 Meg: A bit more work
Download & install Winmerge: http://winmerge.org/ . Select & right click the two pak files (a.pak & b.pak). Click the Winmerge menu item:
[attachment=2]winmerge.png[/attachment]
If the 2 files are identical then you'll see two columns of white in the Winmerge window (see left hand side)
[attachment=0]winm.same.png[/attachment]
If the 2 files are different then you'll see two columns of yellow in the Winmerge Window:
[attachment=1]winm.diff.png[/attachment]
They should be the same
The files should be identical, so if you're seeing even a little bit of yellow in the Winmerge window it means that you're trying to update a "corrupted" version of the Interface.pak file. This means you need to make sure the version you're distributing to your users is identical to the version of which you're basing the patch files.
If the files are the same, then this means that something messed up in either the patch-creation or the patching algorithm. In this case we will definitely need the files.